I had to replace my OEM battery on my 2009
B26 last year because it was getting weak. I got the largest CCA battery from NAPA I could get that was the same size which was the biggest that would fit in the box. I dont expect it to last 9 years like the OEM but who knows, it could.
Replacing batteries lately has a big drain on my bank account since even the tiny motorcycle battery still cost $100 and some for my tractors and truck cost nearly $150.
I did find a replacement for my motorcycle that is an AGM nano gel (whatever that means) for $99 and free shipping. It has 500 CCA compared to other batteries of its size of 350 CCA. Only time will tell if it last more than 1 year.